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arping unable to select the correct interface

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acecase
Posts: 5
Joined: 2018-07-19 21:23

arping unable to select the correct interface

#1 Post by acecase »

I have recently been having to select my interface manually (-I) and I'm not sure if it's a change with arping or with something on my system. My routing table is a little more complex than average, but it hasn't changed since the last time that auto-interface-selection worked.

default via x.x.252.1 dev enp0s25 onlink
x.x.245.0/24 dev enp1s0.245 proto kernel scope link src x.x.245.10
x.x.252.0/24 dev enp0s25 proto kernel scope link src x.x.252.10
x.x.160.0/24 dev enp1s0.160 proto kernel scope link src x.x.160.10
x.x.161.0/24 dev enp1s0.161 proto kernel scope link src x.x.161.60
x.x.162.0/24 dev enp1s0.162 proto kernel scope link src x.x.162.102
x.x.163.0/24 dev enp1s0.163 proto kernel scope link src x.x.163.101
x.x.164.0/24 dev enp1s0.164 proto kernel scope link src x.x.164.59
x.x.165.0/24 dev enp1s0.165 proto kernel scope link src x.x.165.50
x.x.166.0/24 dev enp1s0.166 proto kernel scope link src x.x.166.97
x.x.167.0/24 dev enp1s0.167 proto kernel scope link src x.x.167.65
x.x.168.0/24 dev enp1s0.168 proto kernel scope link src x.x.168.74
x.x.169.0/24 dev enp1s0.169 proto kernel scope link src x.x.169.105
x.x.170.0/24 dev enp1s0.170 proto kernel scope link src x.x.170.92
x.x.171.0/24 dev enp1s0.171 proto kernel scope link src x.x.171.62
x.x.172.0/24 dev enp1s0.172 proto kernel scope link src x.x.172.85
x.x.173.0/24 dev enp1s0.173 proto kernel scope link src x.x.173.94
x.x.174.0/24 dev enp1s0.174 proto kernel scope link src x.x.174.74

$sudo arping x.x.161.3
arping: Suitable device could not be determined. Please, use option -I.
...
(obviously x.x is an edit)

I read in one of the developer's blog posts that arping uses the routing table to select the interface, so I suspect it may be a bug.

I have done quite a bit since the last time that it was automatically detecting the correct interface, so I can't guess what it may have been that broke it.
I've done several updates, and don't know if arping was updated or not. I have also changed the hostname, which I guess could potentially have an affect.

Interfaces are all up and working.

$ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
3: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 74:46:a0:93:14:02 brd ff:ff:ff:ff:ff:ff
inet x.x.252.10/24 brd x.x.252.255 scope global enp0s25
valid_lft forever preferred_lft forever
inet6 fe80::7646:a0ff:fe93:1402/64 scope link
valid_lft forever preferred_lft forever
4: enp1s0.160@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.160.10/24 brd x.x.160.255 scope global enp1s0.160
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
5: enp1s0.161@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.161.60/24 brd x.x.161.255 scope global enp1s0.161
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
6: enp1s0.162@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.162.102/24 brd x.x.162.255 scope global enp1s0.162
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
7: enp1s0.163@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.163.101/24 brd x.x.163.255 scope global enp1s0.163
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
8: enp1s0.164@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.164.59/24 brd x.x.164.255 scope global enp1s0.164
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
9: enp1s0.165@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.165.50/24 brd x.x.165.255 scope global enp1s0.165
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
10: enp1s0.166@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.166.97/24 brd x.x.166.255 scope global enp1s0.166
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
11: enp1s0.167@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.167.65/24 brd x.x.167.255 scope global enp1s0.167
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
12: enp1s0.168@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.168.74/24 brd x.x.168.255 scope global enp1s0.168
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
13: enp1s0.169@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.169.105/24 brd x.x.169.255 scope global enp1s0.169
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
14: enp1s0.170@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.170.92/24 brd x.x.170.255 scope global enp1s0.170
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
15: enp1s0.171@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.171.62/24 brd x.x.171.255 scope global enp1s0.171
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
16: enp1s0.172@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.172.85/24 brd x.x.172.255 scope global enp1s0.172
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
17: enp1s0.173@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.173.94/24 brd x.x.173.255 scope global enp1s0.173
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
18: enp1s0.174@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.174.74/24 brd x.x.174.255 scope global enp1s0.174
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever
19: enp1s0.245@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c4:12:f5:33:57:83 brd ff:ff:ff:ff:ff:ff
inet x.x.245.10/24 brd x.x.245.255 scope global enp1s0.245
valid_lft forever preferred_lft forever
inet6 fe80::c612:f5ff:fe33:5783/64 scope link
valid_lft forever preferred_lft forever

If I use the -I tak and select the correct interface, everything works fine.

Any ideas?

Thanks


P.S. What was wrong with ifconfig? :)
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p.H
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Re: arping unable to select the correct interface

#2 Post by p.H »

The -I option seems to indicate that you are using the version from the iputils-arping package. Maybe try the arping package instead ?
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acecase
Posts: 5
Joined: 2018-07-19 21:23

Re: arping unable to select the correct interface

#3 Post by acecase »

Thank you. I'm not sure how I inadvertently changed packages, but that was the problem.
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